one of my partridge rock hens is all ruffled up with her eyes squinted. she is making a noise that sounds like a 'hick-up'. i noticed her making that noise last week but she looked and acted fine and was eating and roaming the yard as usual. i didnt think much of it. today shes all ruffled with her tail down and not looking good at all. i put duramycin-10 in thier water, a TBSP in a gallon of water. i dont know if thats enough but i need to look and breakdown the dosage for them. what could be wrong with her, and what can i do to help her? i had some chickens last year present the same symptoms and then shortly after die, so i need to act fast! thanks!